JPH0523638Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a pin device for a pin joint for construction machinery.

BACKGROUND ART FIG. 3 is an overall side view of a hydraulic excavator among construction machines. In the figure, 1 is the lower traveling body of the hydraulic excavator, 2 is the upper rotating body, and 3 is the upper rotating body 2.
Work attachment attached to the front part of the 4
is the boom of work attachment 3, 5 is the arm,
6 is a bucket, 7 is a boom cylinder, 8 is an arm cylinder, 9 is a bucket cylinder, 10 is an idler plate, 11, 12, 13, 14, 15, 1
Reference numerals 6 indicate pin joint portions corresponding to the joint portions of the working attachment 3, respectively. FIG. 4 is a sectional view of the pin joint portion 16 of the pin joint portions.
In the figure, 17 is a bracket member of the bucket 6, 18 is a boss member of the arm 5, 19 and 20 are bushes fitted to the bracket member 17, respectively.
Numerals 21 and 22 are bushes fitted onto the boss member 18, 23 is a connecting pin, 24 is the head of the connecting pin 23, 25 and 26 are pin insertion holes, 27 are pin retaining bolts and nuts, 28, 29 are seal members, respectively.

Next, the configuration of the prior art pin coupling section 16 will be described with reference to FIG. Connecting pin 23 with head 24
into the through hole between the pin insertion hole 25 for the bracket member 17 and the pin insertion hole 26 for the boss member 18,
Further, it is fixed to the bracket member 17 side with a bolt and nut 27 for preventing the pin from coming off.

Next, the lubrication effect in the conventional pin joint portion 16 will be described. The connecting pin 23 is fastened to the bracket member 17, and the bracket member 17 and the boss member 18 rotate relative to each other. When grease is injected from the grease nipple 30 provided on the connecting pin 23, the grease passes through the passage 31 and reaches the boss member 1.
The oil reservoir 32 inside 8 is filled. and,
As the bracket member 17 and the boss member 18 rotate relative to each other, the rotating and sliding surfaces between the inner circumferential surface of the pin insertion hole 26 of the boss member 18 and the outer circumferential surface of the connecting pin 23 are lubricated by the grease.

In addition, a curved groove is drilled on the outer periphery of the connecting pin,
Some connecting pins are designed to be effectively lubricated with grease.

Problems to be solved by the invention The lubrication of the conventional pin joint in Fig. 3 is as follows:
This is done by injecting grease into a grease nipple provided on the connecting pin or the boss member (the boss member is not shown). However, the position of the pin joint on the tip side of the working attachment of a hydraulic excavator is quite far from the operator's seat, and the number of greasing operations is frequent, which is a hassle and reduces work efficiency.

The object of this invention is to solve the above-mentioned problems and provide a non-lubricated pin device that retains lubricating oil and fat in the pin joint portion on the entire outer peripheral surface of the connecting pin.

Means for Solving the Problems The means of this invention taken to solve the above problems are as follows: (a) The pin device of the present invention comprises one bracket member having a pin insertion hole, and a boss member serving as a mating member. are rotatably connected to each other by a connecting pin having a curved groove on the outer circumferential surface, and lids are provided in the pin insertion holes on both left and right outer surfaces of the bracket member, and the connecting pin is connected to the pin connecting portion. This is a pin device that is oil-tightly sealed inside the rotary bracket member and the boss member. The overall length is set to be shorter than the distance between the outer surfaces of the bracket member, and a lubricating oil reservoir is formed between the inner surface of the lid body and the end surface of the connecting pin, and a curved groove is formed along the outer circumferential surface of the pin. Drills are made so that both ends of the connecting pin communicate with each other, and the oil and fat in the oil reservoir is sent out into the curved groove by moving the connecting pin in the axial direction.

Function A: Since the connecting pin is inserted into the pin insertion hole of the bracket member and the boss member, and lids are provided on both the left and right outer surfaces of the bracket member, the connecting pin will not slip out to the outside side. . Further, the connecting pin is rotatable within the pin insertion hole and movable in the axial direction.

(b) Since oil reservoirs are formed between the inner surfaces of both the left and right lids and both end faces of the connecting pin, if the connecting pin moves to the left and right in the axial direction when the bracket member and boss member mutually rotate, The oil in the oil reservoir on the side that is moved and pushed is sent to the oil reservoir on the opposite side through a curved groove drilled on the outer circumference of the pin, resulting in automatic lubrication over a long period of time at the pin joint. This makes it possible to make the pin joint part of the hydraulic excavator a non-greasy pin device.

The pin device according to the present invention will be described in detail below with reference to the drawings. Fig. 1 is a cross-sectional view of the pin device according to the present invention. In the drawing, the same reference numerals are used for the same components as those in the prior art. 33 is a bracket member, 34 and 35 are bushes fitted to the bracket member 33, 36 is a connecting pin, 37 is a curved groove of the connecting pin 36, 38 is a left and right cover, 39 is a tightening bolt,
Reference numerals 40 and 41 denote grease reservoirs, and 42 denotes a seal member.

Next, the configuration of the pin device according to this invention will be explained as follows.
Let's talk about the diagram. Connect the entire length of the pin to bracket member 3.
3, and a curved groove 37 is bored along the outer peripheral surface of the pin so as to communicate between the A side and the B side of both end faces of the connecting pin 36. were inserted into the pin insertion holes 43 and 26. On the other hand, lids 38 and 38 are provided in pin insertion holes on both outer side surfaces of the bracket member 33, respectively.
Lubricating oil reservoirs 40, 4 with gap widths l ₁ and l 2, respectively, between the inner C sides and D sides of the lids 38 and 38, and both end faces A and _B of the connecting pin 36, respectively.
1 was formed. At the same time, the bracket member 3
3 and the boss member 18, the connecting pin 36 is configured to be rotatable within the pin insertion holes 43, 26 and movable in the axial direction. FIG. 2 is a partial cross-sectional view of the pin device according to this invention, in which spring members 44 are attached to oil reservoirs 40 and 41 between both end surfaces of the connecting pin 36 and the left and right lids 38, respectively. Good too.

Next, the functions of the pin device according to this invention will be described. Connect the connecting pin 36 to the bracket member 3.
3 and into the pin insertion holes 43 and 26 of the boss member 18, and the lids 38 and 38 are respectively provided on both the left and right outer side surfaces of the bracket member 33, so that the connecting pin 36 does not come out laterally. There isn't. Further, the connecting pin 36 is rotatable within the pin insertion holes 43 and 26 and movable in the axial direction. Both left and right lids 3
Since oil reservoirs 40 and 41 are formed between the inner surfaces of the connecting pins 8 and 38 and both end faces of the connecting pin 36, the oil reservoirs 40, 41 and 32 are filled with oil. Therefore, the bracket member 33 and the boss member 18
If the connecting pin 36 moves left and right in response to a thrust component in the axial direction when the The oil is sent through the curved groove 37 to the oil reservoir on the opposite side. Therefore, the pin device according to this invention makes the pin connection portion of the hydraulic shovel non-lubricated and enables automatic lubrication over a long period of time.

Effects of the invention Lubrication of the conventional pin joint is performed by injecting grease into a grease nipple provided on the connecting pin or the boss member. However, the position of the pin joint on the tip side of the working attachment of the oil shovel is quite far from the driver's seat, and the number of greasing operations is frequent, which is a hassle and reduces work efficiency.

However, in the pin device according to this invention, the connecting pin is inserted into the pin insertion hole of the bracket member and the boss member, and a lid body is provided on both the left and right outer side surfaces of the bracket member, and the lid body is Oil reservoirs were formed on the inner surface and between both end faces of the connecting pin. For this purpose, once the oil reservoir is filled with lubricating oil, when the connecting pin moves to the left and right in the axial direction when the bracket member and boss member mutually rotate, the lubricating oil will be absorbed into the connecting pin. It automatically lubricates itself by passing through the curved grooves.

Therefore, a hydraulic excavator equipped with the pin device according to this invention can work without lubrication for a long time, and the rotation of the connecting pin prevents uneven wear on the outer circumference of the pin. ,
Improves maintainability of pin joints and helps save labor.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the pin device according to this invention.
FIG. 2 is a partial sectional view of the pin device, FIG. 3 is an overall side view of the hydraulic excavator, and FIG. 4 is a sectional view of a conventional pin joint. 11, 12, 13, 14, 15, 16... Pin joint portion, 17, 33... Bracket member, 18...
...Boss member, 23, 36...Connection pin, 25, 2
6, 43...Pin insertion hole, 32, 40, 41...
Oil reservoir portion, 37...Curved groove, 38...Lid body.

Claims (1)

[Scope of utility model registration request] one bracket member having a pin insertion hole;
A boss member serving as a counterpart member is rotatably connected to each other by a connecting pin having a curved groove on the outer circumferential surface, and lids are provided in pin insertion holes on both left and right outer side surfaces of the bracket member. , a pin device in which a connecting pin is oil-tightly enclosed inside a pin joint part, and the connecting pin is moved axially by an external force in the thrust direction that acts on the connecting pin when the bracket member and boss member rotate. Therefore, the total length of the connecting pin is set to be shorter than the distance between the outer surfaces of the bracket member, and a lubricating oil reservoir is formed between the inner surface of the lid body and the end surface of the connecting pin, and a curved groove is formed. A pin device characterized in that a hole is formed along the outer periphery of the pin so as to communicate with both ends of the connecting pin, and oil and fat in the oil reservoir are sent to a curved groove by moving the connecting pin in the axial direction. .